I have a set of experiments running on a cluster node which is running ESXi 5.1, and I want to monitor the resource consumption on the node itself. Specifically, I am currently running experiments on a subset of the VMs on the ESXi host and wish to monitor resource consumption on those specific VMs.

Right now, since I'm using only a single ESXi host, I am using vSphere to access it and the performance reports. Ideally, I would like to get these reports for different time intervals.

I can already get the charts for a time interval of 1h, but these are rather long-running experiments and something like 2h, 3h,... would be preferable. However, I cannot seem to change the time interval. Here is an example of what my Customize Performance Chart dialog shows:

I am also running on a trial key at the moment.

How can I change this interval? Do I need a standard license, or do I just need to turn off the VM (unlikely, but I haven't attempted it yet as these are long-running experiments)?

Any help (or pointers to documentation which deals with the above -- I've already looked but did not find much) would be greatly appreciated.